[Easy] Update Dependencies

[bh2smith]

1. Updating Dependencies
2. Reduce feature scope of tokio dependency.
3. Resolve code scanning warning - adding permissions to CI files.

[cursor]

PR Summary

Medium Risk
Dependency upgrades (notably reqwest and tokio) can introduce behavioral/API changes in async networking and runtime behavior, though code changes are minimal.

Overview
Updates dependencies to newer versions: chrono 0.4.43, reqwest 0.13.2, and tokio 1.49.0, and changes tokio features from full to a narrower set (rt-multi-thread, time, macros).

Adds #![allow(unused_crate_dependencies)] to tests/example.rs to silence unused-dependency linting in the integration test.

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